A polling card and voting guide for the 2016 EU Referendum (Yui Mok/PA Wire)

TONIGHT marks the deadline for registering to vote in the upcoming EU Referendum.

If you aren’t registered to vote, you only have until midnight to do so.

But don’t panic – it’s an easy process and here’s our guide on all you need to know.

Can I vote?

You can vote in the referendum if you are registered to vote in the UK, are 18 or over on 23 June 2016 and are:

A British or Irish citizen living in the UK, or
A Commonwealth citizen living in the UK who has leave to remain in the UK or who does not require leave to remain in the UK, or
A British citizen living overseas who has been registered to vote in the UK in the last 15 years, or
An Irish citizen living overseas who was born in Northern Ireland and who has been registered to vote in Northern Ireland in the last 15 years.

How to register

Registering is a simple and quick process and can be done online here (if you’re in Northern Ireland you’ll need to fill out a separate form.)

You’ll need your date of birth, National Insurance number and British passport if you live abroad.

If you’re planning to use a postal vote, the deadline is tomorrow (June 8) at 5pm, with completed ballots to be arrive back before 10pm on June 23.

To apply to vote by proxy, you’ll need to complete a separate application form be returned by 5pm on June 15.

Do I need to register?

You don’t need to register again in order to vote in the EU referendum if you live in the UK and you were registered to vote in the May 2016 elections or the 2015 General Election and you still live at the same address.

If you’re not sure if you’re registered you can contact your local electoral registration office – click here to find out more.

Voting on June 23

You can vote in person at your local polling station between 7am and 10pm.

You can fill out a postal vote (see above for deadline details) or vote by proxy.

The ballot paper will look like this:

You’ll have the choice of two options, ‘Remain a member of the European Union’ or ‘Leave the European Union’ – put a cross in only one of the boxes.

Surge of applications before deadline

More than 1.35 million people have applied online to register to vote in the past few weeks, the Electoral Commission said.

The applications have been made since a public awareness campaign about voting was launched on May 15 by the commission, in the build-up to the EU referendum.